
The fulladder circuit adds three onebit binary numbers (C A B) and outputs two onebit binary numbers, a sum (S) and a carry (C1). The fulladder is usually a component in a cascade of adders, which add 8, 16, 32, etc. binary numbers. The carry input for the fulladder circuit is from the carry output from the circuit "above" itself in the cascade. The carry output from the full adder is fed to another full adder "below" itself in the cascade. If you look closely, you'll see the full adder is simply two half adders joined by an OR. Select an input combination from the pulldown selector and view the resulting output.
